Intelligent
Intelligent adjective - Having the ability to reason.
Usage example: there is some debate over whether dolphins are intelligent animals
Mental and intelligent are semantically related In some cases you can use "Mental" instead an adjective "Intelligent".
Mental
Mental adjective - Of or relating to the mind.
Usage example: a funny mental image made him laugh out loud
Intelligent and mental are semantically related in smart topic. Sometimes you can use "Intelligent" instead an adjective "Mental".
Mutual synonyms
Both words in one sentence
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The main character, Jix suffers from the human mental ailment of split-personality, though being an intelligent race, it's possible that this might crop up in other intelligent races.
Source: Most Writers Are Human - River Tam in Firefly is unbelievably intelligent, combat-capable, and psychic, but her usefulness in a number of situations is clouded by mental instability.
Source: Sanity Has Advantages -
Darguls are still somewhat intelligent and recognizable as persons, but show signs of physical and mental deterioration.
Source: Video Game / Pillars of Eternity
Cite this Source
Mental and Intelligent. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/intelligent/mental
Intelligent & Mental. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/intelligent/mental>.
Mental or Intelligent. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/intelligent/mental.
Google Ngram Viewer shows how "intelligent" and "mental" have occurred on timeline